CN110508132B - Denitration system and denitration method for efficient denitration of SCR of gas turbine unit - Google Patents
Denitration system and denitration method for efficient denitration of SCR of gas turbine unit Download PDFInfo
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- CN110508132B CN110508132B CN201910889201.4A CN201910889201A CN110508132B CN 110508132 B CN110508132 B CN 110508132B CN 201910889201 A CN201910889201 A CN 201910889201A CN 110508132 B CN110508132 B CN 110508132B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
The invention discloses a denitration system for efficient denitration of an SCR (selective catalytic reduction) of a gas turbine unit, which comprises the following components: the upstream end of the flue gas channel is used for being connected with the gas turbine set, and the downstream end of the flue gas channel is used for being connected with a chimney; the preheating pipeline is arranged at the upstream of the flue gas channel, one end of the preheating pipeline is used for being connected with a urea solution source, the other end of the preheating pipeline is provided with a spray gun, and the spraying direction of the spray gun is consistent with the axial direction of the flue gas channel; the despin device is arranged in the flue gas channel, is positioned at the downstream of the preheating pipeline and is used for converting the spiral motion of the flue gas into linear motion along the flue gas channel; and the catalyst layer is arranged in the flue gas channel and is positioned at the downstream of the heat exchange tube bundle, and the catalyst layer is of a honeycomb structure or a corrugated plate structure. The denitration system has the advantages of high denitration efficiency, stable performance, compact arrangement, simple equipment, energy conservation, environmental protection and the like.
Description
Technical Field
The invention belongs to the technical field of exhaust gas pollution control, and particularly relates to a denitration system and a denitration method for efficient denitration of an SCR (selective catalytic reduction) of a gas turbine unit.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the rapid development of the world, particularly the Chinese society, safety, environmental protection and new energy become topics, and the emission and treatment of gas, liquid and solid pollutants are advanced to unprecedented levels. The emission control of nitrogen oxides also becomes a central element in gas pollution control. At present, the national Beijing, Tianjin and Shenzhen have established strict emission standards of nitrogen oxides of combustion engines, and the Beijing and the Tianjin all require the nitrogen oxides to be controlled at 30mg/m3Shenzhen even requires the nitrogen oxide to be controlled at 15mg/m3Within, Hebei will also get a new environmental index.
The fuel of the gas turbine is mainly natural gas and the like, the discharged flue gas has the characteristics of low dust, low sulfur and high nitrogen, and the ultra-low concentration discharge of the polluted gas can be realized by adopting an efficient nitrogen oxide discharge reduction technology. The design of the SCR process system and the main device of the gas turbine generator set needs to adapt to the exhaust condition and the structural characteristics of waste heat utilization, the key influence factors and parameter setting of the process model are greatly different from those of a coal-fired unit, and the SCR process system and the main device have extremely high requirements on flow field control of a reaction area, configuration parameters of a high-activity catalyst, the injection position and mode of a denitration reducing agent and the like.
The current SCR technology is mainly to pyrolyze urea in an ammonia preparation device outside a combustion engine by leading through a heat source to prepare ammonia, and then the ammonia is sprayed into a flue through an ammonia spraying grid to carry out denitration. The process and equipment are complex, the occupied area is large, the heat source leading and the ammonia gas preparation and storage are difficult, the system pipeline is complex, and the compact arrangement requirement of the gas turbine is difficult to meet. The urea pyrolysis response is too long, and the pyrolysis reactor is easy to cause problems in long-term operation, so that the denitration efficiency of the gas turbine is influenced. In addition, the ammonia spraying grid is difficult to ensure the mixing uniformity and the thoroughness of the flue gas and the ammonia gas, the flow field condition in the flue is complex, the contact between the catalyst and the flue gas is insufficient, and the denitration efficiency is reduced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a denitration system and a denitration method for efficient denitration of a gas turbine unit SCR. The denitration system has the advantages of high denitration efficiency, stable performance, compact arrangement, simple equipment, energy conservation, environmental protection and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a denitration system of high-efficient denitration of gas turbine unit SCR includes:
the upstream end of the flue gas channel is used for being connected with the gas turbine set, and the downstream end of the flue gas channel is used for being connected with a chimney;
the preheating pipeline is arranged at the upstream of the flue gas channel, one end of the preheating pipeline is used for being connected with a urea solution source, the other end of the preheating pipeline is provided with a spray gun, and the spraying direction of the spray gun is consistent with the axial direction of the flue gas channel;
the despin device is arranged in the flue gas channel, is positioned at the downstream of the preheating pipeline and is used for converting the spiral motion of the flue gas into linear motion along the flue gas channel;
and the catalyst layer is arranged in the flue gas channel and is positioned at the downstream of the heat exchange tube bundle, and the catalyst layer is of a honeycomb structure or a corrugated plate structure.
The exhaust temperature of the gas turbine is high, the preheating pipeline is arranged at the upstream of the flue gas channel, the urea solution is injected into the preheating pipeline and preheated to reach the temperature of 300-400 ℃, and subsequent atomization and pyrolysis of the urea solution are easily realized.
The flue gas discharged by the gas turbine flows spirally, the atomized urea solution is sprayed into the spirally flowing flue gas along the axial direction of the flue gas channel, and the atomized urea solution is easier to be uniformly mixed with the flue gas under the disturbance of the flue gas because the spraying direction of the atomized urea solution is greatly different from the local flowing direction of the flue gas. The urea liquid drops which are uniformly dispersed are easily decomposed after being uniformly heated.
After urea decomposes completely, the flue gas carries the ammonia flow after the decomposition and flows through the racemization device, the racemization device plays the integrated effect of rotatory air current to the flue gas, it is forward by the spiral to mix the flue gas, for along the straight forward motion of flue, the mixing of flue gas and ammonia has further been promoted, and make the flue gas distribute evenly, get into the catalyst layer with good flow field characteristic, with the even degree that improves flue gas denitration, and alleviate the impact to the catalyst layer, make flue gas denitration process more steady, effectively go on. The catalyst layer is honeycomb structure or buckled plate structure, has great specific surface area, can reduce the flow resistance loss, can show improvement flue gas denitration efficiency.
In some embodiments, the denitration system comprises a heat exchange tube bundle of a superheater, an economizer and the like of the waste heat boiler, and the heat exchange tube bundle is arranged in the flue gas channel and is positioned between the despin device and the catalyst layer.
Because the inner wall of the flue can generate certain frictional resistance to flowing flue gas, the flue gas close to the inner wall of the flue has low flow velocity and is difficult to be uniformly mixed with ammonia gas. Therefore, when the heat exchange tube bundle is arranged at the upstream of the catalyst, on one hand, the waste heat in the flue gas can be recovered, the waste of energy is reduced, the temperature of the flue gas is adjusted to the proper temperature for flue gas denitration, and the denitration efficiency of the flue gas is improved; on the other hand, the flue gas denitration catalyst plays a role in rectifying the flow of the flue gas, so that the flue gas and ammonia are further uniformly mixed, the mixed gas of the flue gas and the ammonia is uniformly distributed on the cross section of the whole flue, and when the mixed gas passes through the catalyst layer, all parts of the catalyst layer can be effectively utilized, and the uniformity of flue gas denitration can be improved.
In some embodiments, the spray gun is an air atomization spray gun. The air atomization spray gun can enable the ammonia water solution to be atomized more uniformly.
Furthermore, the number of the spray guns is 2-10, and the spray guns are uniformly distributed on the cross section of the flue gas channel in a ring shape.
Furthermore, the circle where the plurality of spray guns are located and the flue gas channel are concentric circles.
The spray guns are uniformly distributed on the concentric circle of the flue gas channel, so that the urea solution can be sprayed into the flue gas at multiple points more uniformly, and the flue gas and the urea solution can be mixed uniformly more easily.
In some embodiments, a plurality of rectifying channels are arranged in the despinning device, the axis of each rectifying channel is parallel to the axis of the flue gas channel, and at least one rectifying blade is arranged in each rectifying channel.
The rectifying blades are fixed on the rectifying channel, the rectifying channel divides the airflow into small airflow, the rotating airflow collides with the surface of the blade to rebound and reduce the rotating angular velocity by means of the parabolic shape of the blades, the rotating airflow is converted into straight airflow moving along the axial direction, and the orientation of the blades is opposite to that of the blades in the gas turbine.
Furthermore, the rectifying blades are paraboloid-shaped, and the length direction of the rectifying blades is perpendicular to the flowing direction of the flue gas.
A plurality of rectifying channels are arranged in the racemization device, and the number of the rectifying channels can be 4, 5, 6, 7 or even more. The flue gas is divided into a plurality of parts for rectification, so that the rectification of the flue gas is easier to carry out, and all positions of the section of the flue gas can be successfully rectified.
Further, the inner diameter of each rectifying channel is that of each rectifying channel:
the length of the rectifying channel is as follows: l isZAnd d is (16-20) x d, wherein d is the inner diameter of the rectifying channel, and the length of the rectifying channel ensures that the rectified air is uniform axial straight air flow.
In some embodiments, the flue gas of the gas turbine has extremely low dust content, so that the cost can be reduced by selecting a thin-wall catalyst layer with the inner wall thickness of 0.6-0.7 mm. The catalyst is arranged in a plurality of layers, such as 4+1 arrangement scheme.
In some embodiments, the distance between the lance and the racemization apparatus satisfies the following requirements:
wherein m is the mass of the urea solution sprayed by a single spray gun in unit time; rho is the mass density of the urea solution; t is the time required for pyrolysis of the urea solution at the flue gas temperature; d1The diameter of a circle enclosed by a plurality of spray guns.
A denitration method for efficient denitration of an SCR (selective catalytic reduction) of a gas turbine unit comprises the following steps:
the urea solution is preheated to 300-400 ℃ under the heating action of the high-temperature flue gas, and the preheated urea solution is atomized and sprayed into the flue gas flowing forwards spirally through a spray gun and is heated and decomposed into ammonia gas in the process of mixing with the flue gas;
after the urea is completely decomposed, the mixed gas of the flue gas and the ammonia gas flows through a racemization device for rectification, so that the spiral forward movement is rectified into linear movement, and the flue gas and the ammonia gas are uniformly mixed;
and after waste heat recovery, the uniformly mixed gas enters the catalyst layer to be subjected to catalytic denitration.
In some embodiments, the requirement for uniformity of concentration distribution of ammonia in the flue gas meets the following requirements:
on the cross section 0.5m upstream of the catalyst layer, the maximum deviation coefficient CV of the ammonia concentration-velocity distribution is less than or equal to 5 percent,
wherein:
average concentration value; vi: sampling values; n number of sampling points.
The invention has the beneficial effects that:
1) the technological process of SCR denitration of the gas turbine is simplified. The ammonia is directly generated by urea pyrolysis in the flue, so that the processes of preparing ammonia and spraying ammonia are omitted, the working time of denitration of the gas turbine is reduced, and the working efficiency is improved.
2) The process of directly spraying urea is adopted, and a complex and heavy ammonia gas generating device is not needed, so that the denitration system is simpler, and the cost is reduced. The storage and transportation of the urea are more convenient than the ammonia, and the pollution caused by ammonia leakage is avoided.
3) Make full use of gas turbine exhaust characteristics utilizes the spiral motion of flue gas to make the urea and the natural homogeneous mixing of flue gas, utilizes the flue gas waste heat to carry out preheating and the pyrolysis of urea, and the mixed degree of consistency of ammonia and flue gas is higher than the ammonia injection grid, has effectively improved denitration efficiency.
4) The spiral flue gas can be rectified by adopting a despin device, so that the rotation of the flue gas is eliminated, and the flow field of the whole flue gas channel is optimized; in addition, a part of flue gas heat exchange tube bundles are added into the waste heat boiler, so that on one hand, the urea solution can be preheated for fast pyrolysis, on the other hand, the flue gas can be further rectified by the heat exchange tube bundles, and the flue gas flow field can be optimized; before reaching the catalyst layer, the flue gas in the flue is uniformly distributed, the ammonia gas and the flue gas are fully mixed, and the mixing deviation of the ammonia gas and the flue gas is more optimized compared with that of a conventional ammonia spraying system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of an SCR denitration process according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an air atomization spray gun according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the arrangement of the spray guns in the flue of the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a racemization apparatus in an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a racemization apparatus in an embodiment of the present invention;
fig. 6 is a schematic structural view of a blade in an embodiment of the present invention.
In the figure: 1. the device comprises a gas turbine flue, 2 parts of a preheating pipeline, 3 parts of a spray gun, 4 parts of a despin device, 5 parts of a heat exchange tube bundle, 6 parts of a catalyst layer, 7 parts of a tail flue, 8 parts of a chimney, 9 parts of a guide pipe and 10 parts of a flue gas channel.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, a denitration system for efficient denitration of gas turbine unit SCR includes:
a flue gas channel 10, the upstream end of which is connected to the gas turbine unit via a gas turbine flue 1, and the downstream end of which is used for connecting to a chimney 8 or a flue gas treatment device;
the preheating pipeline 2 is arranged at the upstream of the flue gas channel 10 in a disc mode, one end of the preheating pipeline is used for being connected with a urea solution source, the other end of the preheating pipeline is provided with a spray gun 3, and the spraying direction of the spray gun 3 is consistent with the axial direction of the flue gas channel; as shown in fig. 2, the spray gun 3 is an air atomizing spray gun. As shown in fig. 3, the air atomization spray gun can atomize the ammonia solution more uniformly; the number of the spray guns 3 is 2-10, such as 2, 3, 4, 5, 6, 7, 8, 9 and 10, and a plurality of spray guns 3 are annularly and uniformly distributed on the cross section of the flue gas channel; the circle where the plurality of spray guns 3 are located and the flue gas channel are concentric circles.
The spray guns 3 are uniformly distributed on the concentric circle of the flue gas channel 10, so that the urea solution can be sprayed into the flue gas at multiple points more uniformly, and the flue gas and the urea solution can be more easily mixed uniformly.
The despin device 4 is arranged in the flue gas channel 10 and is positioned at the downstream of the preheating pipeline 2 as shown in fig. 4, and is used for converting the spiral motion of the flue gas into the linear motion along the flue gas channel; the distance between the spray gun and the despinning device meets the following requirements:
wherein m is the mass of the urea solution sprayed by a single spray gun in unit time; rho is the mass density of the urea solution; t is the time required for pyrolysis of the urea solution at the flue gas temperature; d1The diameter of a circle enclosed by a plurality of spray guns.
As shown in fig. 5, a plurality of rectifying channels are arranged inside the despinning device 4, the axis of each rectifying channel is parallel to the axis of the flue gas channel, and at least one rectifying blade is arranged in each rectifying channel. The flow straightening vanes are parabolic in shape and perpendicular to the flow direction of the flue gas, as shown in fig. 6. The rectifying blades are fixed on the rectifying channel, the rotating airflow collides with the blade surface to rebound and reduce the rotating angular velocity by means of the parabolic shape of the blades, and the rotating airflow is converted into straight airflow moving along the axial direction.
A plurality of rectifying channels are arranged in the racemization device, and the number of the rectifying channels can be 4, 5, 6, 7 or even more. The flue gas is divided into a plurality of parts for rectification, so that the rectification of the flue gas is easier to carry out, and all positions of the section of the flue gas can be successfully rectified.
The inner diameter of each rectifying channel is:
the length of the rectifying channel is as follows: l isZAnd (16-20) x d, wherein d is the inner diameter of the rectifying channel.
The heat exchange tube bundle 5 is arranged in the flue gas channel 10 and is positioned between the despinning device 4 and the catalyst layer 6, and the heat exchange tube bundle 5 is connected with the waste heat boiler 7.
The catalyst layer 6 is arranged in the flue gas channel and is positioned at the downstream of the heat exchange tube bundle 5, and the catalyst layer 6 is of a honeycomb structure or a corrugated plate structure; the catalyst layer 6 is a thin-wall catalyst layer with the inner wall thickness of 0.6-0.7 mm, and the cost can be reduced because the dust content of the flue gas of the gas turbine is extremely low. The catalyst is arranged in a plurality of layers, such as 4+1 arrangement scheme.
The gas turbine flue gas enters the flue gas channel from the gas turbine flue 1 and preheats the urea solution in the urea solution preheating pipeline 2, so as to promote the atomization and pyrolysis of the urea solution, and the temperature of the urea solution is preheated to between 150 and 200 ℃. The preheated urea solution flows to the atomizing spray gun 3 through the conduit 9 to be atomized and then enters the flue. In the flue, the urea droplets are mixed with the flue gas coming from the spiral movement. As the temperature of the flue gas of the combustion engine is higher, generally between 500 ℃ and 900 ℃, the urea solution is evaporated and pyrolyzed to generate ammonia gas. After passing through a flue with a long enough length (urea solution is fully evaporated and pyrolyzed), the mixed gas becomes uniform axial flow through the airflow rectifier 4 and enters the waste heat boiler 7, heat is exchanged at the heat exchange tube bundle 5 of the waste heat boiler, denitration is performed at the catalyst layer 6 of the SCR denitration part of the waste heat boiler, and finally the treated flue gas enters the chimney 8 to be discharged.
The urea solution is sprayed into the flue after being atomized by an atomizing spray gun shown in figure 2 arranged on the flue. The arrangement of the spray guns is schematically shown in FIG. 3, and eight spray guns are uniformly arranged at a diameter D1The atomized liquid drops sprayed by the spray gun horizontally enter the flue, and are evaporated and pyrolyzed into ammonia gas under the action of high-temperature flue gas.
In the process of evaporation pyrolysis, ammonia and flue gas are mixed to a certain degree. In order to optimize the flow field and improve the mixing uniformity, a despin device 4 is additionally arranged in front of the waste heat boiler 7. The plate rectifier and the parabolic rectifying blades are additionally arranged in the pipeline, so that the rotating airflow is shaped to uniformly flow along the axial direction, and the flow field in the flue is optimized. After passing through the gas rectifier, the heat exchange tube bundle 5 of the waste heat boiler can improve the mixing uniformity of ammonia and flue gas, the flue gas in a flow field is more uniform, and the escape amount of ammonia is effectively reduced.
The checking surface of the ammonia concentration distribution uniformity is a cross section at 0.5m upstream of the surface of the first layer catalyst, and the maximum deviation Coefficient (CV) of the ammonia concentration velocity distribution at the cross section is required to be less than or equal to 5 percent. CV is defined as:
wherein:
average concentration value; vi: sampling values; n number of sampling points.
Through the effect of airflow rectifier and exhaust-heat boiler heat exchanger tube bank, the degree of the even mixing of flue gas and ammonia can reach the index requirement that (CV) is less than or equal to 5%, need not to add ammonia injection grid and guide plate, can make the rectification degree of mixing higher, and the flue gas flow field is more optimized.
The catalyst layer 6 needs to select a honeycomb or corrugated plate type catalyst with a large specific surface area, so that ammonia gas and nitrogen oxide fully react, the loss of flow resistance is reduced, the flue gas utilization efficiency is improved, and the purpose of high-efficiency denitration is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The utility model provides a denitration system of high-efficient denitration of gas turbine unit SCR which characterized in that: the method comprises the following steps:
the upstream end of the flue gas channel is used for being connected with the gas turbine set, and the downstream end of the flue gas channel is used for being connected with a chimney;
the preheating pipeline is arranged at the upstream of the flue gas channel, one end of the preheating pipeline is used for being connected with a urea solution source, the other end of the preheating pipeline is provided with a spray gun, and the spraying direction of the spray gun is consistent with the axial direction of the flue gas channel;
the despin device is arranged in the flue gas channel, is positioned at the downstream of the preheating pipeline and is used for converting the spiral motion of the flue gas into linear motion along the flue gas channel;
the catalyst layer is arranged in the flue gas channel and is positioned at the downstream of the heat exchange tube bundle, and the catalyst layer is of a honeycomb structure or a corrugated plate structure;
the distance between the spray gun and the despinning device meets the following requirements:
wherein m is the mass of the urea solution sprayed by a single spray gun in unit time; rho is the mass density of the urea solution; t is the time required for pyrolysis of the urea solution at the flue gas temperature; d1The diameter of a circle enclosed by a plurality of spray guns.
2. The denitration system for efficient denitration of gas turbine unit SCR according to claim 1, characterized in that: the waste heat boiler is characterized by further comprising a superheater and/or an economizer of the waste heat boiler, wherein the superheater and/or the economizer are arranged in the flue gas channel and are located between the despinning device and the catalyst layer.
3. The denitration system for efficient denitration of gas turbine unit SCR according to claim 1, characterized in that: the spray gun is an air atomization spray gun.
4. The denitration system for efficient denitration of gas turbine unit SCR according to claim 3, wherein: the number of the spray guns is 2-10, and the spray guns are uniformly distributed on the cross section of the flue gas channel in a ring shape.
5. The denitration system for efficient denitration of gas turbine unit SCR according to claim 3, wherein: the circle where the plurality of spray guns are located and the flue gas channel are concentric circles.
6. The denitration system for efficient denitration of gas turbine unit SCR according to claim 1, characterized in that: the de-rotation device is characterized in that a plurality of rectifying channels are arranged in the de-rotation device, the axis of each rectifying channel is parallel to the axis of the flue gas channel, and at least one rectifying blade is arranged in each rectifying channel.
7. The denitration system for efficient denitration of gas turbine unit SCR according to claim 4, wherein: the rectifying blades are paraboloid-shaped, and the length direction of the rectifying blades is perpendicular to the flowing direction of the flue gas.
8. The denitration system for efficient denitration of gas turbine unit SCR according to claim 4, wherein: the inner diameter of each rectifying channel is:
the length of the rectifying channel is as follows: l isZAnd (16-20) x d, wherein d is the inner diameter of the rectifying channel.
9. The denitration system for efficient denitration of gas turbine unit SCR according to claim 1, characterized in that: the thickness of the inner wall of the catalyst layer is 0.6-0.7 mm, and the catalysts are arranged in a multilayer mode.
10. A denitration method for efficient denitration of a gas turbine unit SCR is characterized by comprising the following steps: the denitration system for efficient denitration by SCR using the gas turbine unit of any one of claims 1 to 9, the denitration method comprising the steps of:
the urea solution is preheated to 300-400 ℃ under the heating action of the high-temperature flue gas, and the preheated urea solution is atomized and sprayed into the flue gas flowing forwards spirally through a spray gun and is heated and decomposed into ammonia gas in the process of mixing with the flue gas;
after the urea is completely decomposed, the mixed gas of the flue gas and the ammonia gas flows through a racemization device for rectification, so that the spiral forward movement is rectified into linear movement, and the flue gas and the ammonia gas are uniformly mixed;
and after waste heat recovery, the uniformly mixed gas enters the catalyst layer to be subjected to catalytic denitration.
11. The denitration method for efficient denitration of gas turbine unit SCR according to claim 10, characterized in that: the uniformity of the concentration distribution of the ammonia gas in the flue gas meets the following requirements:
on the cross section 0.5m upstream of the catalyst layer, the maximum deviation coefficient CV of the ammonia concentration-velocity distribution is less than or equal to 5 percent,
wherein:
average concentration value; vi: sampling values; n number of sampling points.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228793A (en) * | 2011-05-04 | 2011-11-02 | 上海电气石川岛电站环保工程有限公司 | Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device |
| CN102631849A (en) * | 2012-04-17 | 2012-08-15 | 哈尔滨工程大学 | Pre-heating spray-hole type static mixer |
| CN107261802A (en) * | 2017-08-11 | 2017-10-20 | 河南海力特机电制造有限公司 | Heavy pressure fine spray SNCR denitration system |
| CN107448962A (en) * | 2017-08-10 | 2017-12-08 | 江苏鲲鹏环保工程技术有限公司 | A kind of outer denitrating technique system of chain furnace high/low temperature flue gas holding furnace |
| CN209378806U (en) * | 2018-10-16 | 2019-09-13 | 中国华电科工集团有限公司 | A kind of low energy consumption afterburning heated type denitrating system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410542A (en) * | 2011-12-27 | 2012-04-11 | 华南理工大学 | Urea spray gun leakage-prevention sleeve head of waste incineration furnace |
| JP2014101869A (en) * | 2012-11-22 | 2014-06-05 | Toyota Industries Corp | Exhaust emission control system |
| US9067176B2 (en) * | 2013-03-15 | 2015-06-30 | Honeywell International, Inc. | Specialized ammonia injection grid with the dual purpose of suppressing noise |
| KR101724950B1 (en) * | 2015-11-19 | 2017-04-07 | 현대자동차주식회사 | Urea dosing injector cooling apparatus and method using the cooling water in reservoir tank |
| JP6676438B2 (en) * | 2016-03-30 | 2020-04-08 | 日本碍子株式会社 | Reducing agent injection device, exhaust gas treatment method, and exhaust gas treatment device |
| CN206868015U (en) * | 2017-03-21 | 2018-01-12 | 华电电力科学研究院 | SCR denitration system SO can be reduced2/SO3The urea pyrolysis ammonia structure of conversion ratio |
| CN207913517U (en) * | 2017-07-07 | 2018-09-28 | 山东奥能电力科技有限公司 | A kind of tower urea composite hydrolysis reaction system of denitration |
| CN107899411B (en) * | 2017-09-29 | 2019-11-26 | 浙江省环境保护科学设计研究院 | A kind of SCR reaction unit and method for the processing of cement clinker production line kiln exit gas |
-
2019
- 2019-09-19 CN CN201910889201.4A patent/CN110508132B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228793A (en) * | 2011-05-04 | 2011-11-02 | 上海电气石川岛电站环保工程有限公司 | Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device |
| CN102631849A (en) * | 2012-04-17 | 2012-08-15 | 哈尔滨工程大学 | Pre-heating spray-hole type static mixer |
| CN107448962A (en) * | 2017-08-10 | 2017-12-08 | 江苏鲲鹏环保工程技术有限公司 | A kind of outer denitrating technique system of chain furnace high/low temperature flue gas holding furnace |
| CN107261802A (en) * | 2017-08-11 | 2017-10-20 | 河南海力特机电制造有限公司 | Heavy pressure fine spray SNCR denitration system |
| CN209378806U (en) * | 2018-10-16 | 2019-09-13 | 中国华电科工集团有限公司 | A kind of low energy consumption afterburning heated type denitrating system |
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